METHOD OF BUILDING PC UNDERGROUND CONTINUOUS WALL

PURPOSE:To improve rigidity and cut-off ability of the whole of a continuous wall, by a method wherein, after an underground continuous wall is formed in a state in that a lateral sheath is buried, a stretching material is inserted into the lateral sheath for stretching, and a grout material is poured. CONSTITUTION:After a sheath coupling metal 1 is inserted into an excavated trench 17, a reinforcement cage 8 is inserted into the other trench 17. In which case, the end of a lateral sheath 9 previously attached to the reinforcement cage 8 is inserted into engagement pieces 4 of a coupling metal 1 and the engaging pieces form the guide of the reinforcement cage 8. Concrete is then poured to form one section of a continuous wall, and the other trench is excavated to form a continuous wall in a similar manner described above. After the concrete is cured, the interior of the continuous wall is excavated, and a stretching material 21 is inserted into the lateral sheath 9 through a recessed part 22 to introduce prestress.